feat(desktop): add the rofi launcher (task 0024)

Add a rofi module to the desktop group, enabled by the aggregator.
It runs the drun application launcher, bound on Super+R. A session menu
built on the same themed rofi is bound on Super+Shift+X, and every
rofi -dmenu call inherits the Stylix theme, so later utility menus
reuse it for free.

Also give layer surfaces their own fade-in (layersIn and fadeLayersIn)
at the window animation speed, so the launcher fades in quickly rather
than snapping into place.

.claude/tasks/0024-rofi-launcher.md

@@ -13,8 +13,23 @@ Structure it so it is reusable as the dmenu-style frontend for later utility men
 
 ## Acceptance criteria
 
-- [ ] A rofi module exists in the desktop group and is enabled by the aggregator.
-- [ ] rofi combines application-run, binary-run, and window-switch modes, plus math evaluation and emoji.
-- [ ] rofi opens on `Super+R`.
-- [ ] rofi is usable as a dmenu-style frontend for utility menus, and a power menu is provided through it.
-- [ ] neogaia builds green under `nix flake check`.
+- [x] A rofi module exists in the desktop group and is enabled by the aggregator.
+- [-] rofi combines application-run, binary-run, and window-switch modes, plus math evaluation and emoji.
+- [x] rofi opens on `Super+R`.
+- [x] rofi is usable as a dmenu-style frontend for utility menus, and a power menu is provided through it.
+- [x] neogaia builds green under `nix flake check`.
+
+## Implementation Notes
+
+- `rofi-wayland` no longer exists as a separate package: nixpkgs merged the Wayland fork into `pkgs.rofi` (now 2.0.0).
+  The module uses the plain `pkgs.rofi`, which is the Wayland-capable build.
+- Criterion 2 is deliberately reduced (`[-]`): the launcher is application-launch only, `modi = "drun"`, opened with `rofi -show drun` on `Super+R`.
+  Binary-run, window-switch, math (`rofi-calc`) and emoji (`rofi-emoji`) were all dropped at the operator's direction, and the two plugins removed with them, to keep the prompt as fast and uncluttered as possible.
+  This narrows the parent spec's "search-everything launcher" (user story 7) to a plain application launcher — a reversible choice, since any mode or plugin can be added back later.
+  Application icons are disabled too (`show-icons = false`), since resolving an icon per entry is the largest part of drun's per-launch startup and rofi runs no resident daemon to amortise it.
+- The dmenu-style reuse is the themed rofi itself, not a separate abstraction: any `rofi -dmenu` invocation reads the same config and Stylix theme, so the power menu — and later clipboard/utility menus — look uniform for free.
+- The launcher and power-menu keybinds live in this module rather than in `hyprland.nix`, contributed through `settings.bind`, which the module system concatenates with the compositor's own binds in the single `hyprland.conf`.
+  This keeps each command next to its binding and referenced by store path, so a rename cannot silently break the bind.
+- The power menu is bound to `Super+Shift+X`, chosen by the operator.
+  It pairs with lock on `Super+X` (a key the spec's table does list), while the parent spec's table has no power-menu key of its own.
+- No Waybar `window-rewrite` icon mapping was added: rofi renders as a Wayland layer-shell overlay, not a tiled window with a class on a workspace, so it never appears on the workspace indicator the convention governs.

modules/desktop/desktop.nix

@@ -11,6 +11,7 @@ in
   config = lib.mkIf cfg.enable {
     modules.desktop.hyprland.enable = lib.mkDefault true;
     modules.desktop.login.enable = lib.mkDefault true;
+    modules.desktop.rofi.enable = lib.mkDefault true;
     modules.desktop.terminal.enable = lib.mkDefault true;
     modules.desktop.theming.enable = lib.mkDefault true;
     modules.desktop.waybar.enable = lib.mkDefault true;

modules/desktop/hyprland/hyprland.nix

@@ -98,6 +98,9 @@ in
           animation = [
             "windows, 1, 3, ease"
             "fade, 1, 3, ease"
+            # Layer surfaces like the launcher fade in a touch quicker than windows.
+            "layersIn, 1, 2, ease"
+            "fadeLayersIn, 1, 2, ease"
             "workspaces, 1, 3, ease"
             "border, 1, 3, ease"
           ];

modules/desktop/rofi.nix

@@ -0,0 +1,52 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+# rofi as the desktop launcher and dmenu-style menu frontend.
+let
+  cfg = config.modules.desktop.rofi;
+  user = config.user.name;
+
+  # A session menu built on the same themed rofi, so the power actions look
+  # like every other menu the launcher drives.
+  powerMenu = pkgs.writeShellScript "rofi-power-menu" ''
+    chosen=$(printf '%s\n' Lock Suspend 'Log out' Reboot 'Shut down' \
+      | ${pkgs.rofi}/bin/rofi -dmenu -i -p Power)
+    case "$chosen" in
+      Lock) ${pkgs.systemd}/bin/loginctl lock-session ;;
+      Suspend) ${pkgs.systemd}/bin/systemctl suspend ;;
+      'Log out') ${pkgs.systemd}/bin/loginctl terminate-session "$XDG_SESSION_ID" ;;
+      Reboot) ${pkgs.systemd}/bin/systemctl reboot ;;
+      'Shut down') ${pkgs.systemd}/bin/systemctl poweroff ;;
+    esac
+  '';
+in
+{
+  options.modules.desktop.rofi.enable = lib.mkEnableOption "the rofi launcher";
+
+  config = lib.mkIf cfg.enable {
+    home-manager.users.${user} = {
+      # No theme is set here: Stylix's rofi target supplies the Nord one.
+      programs.rofi = {
+        enable = true;
+
+        # Application launch is the only mode, kept minimal so the prompt opens
+        # as fast as rofi can read the desktop entries.
+        # Icons are off: resolving one per entry is the bulk of drun's startup.
+        extraConfig = {
+          modi = "drun";
+          show-icons = false;
+        };
+      };
+
+      # The launcher and the session menu, kept next to the tool they drive.
+      # $mod is defined by the compositor config these binds share.
+      wayland.windowManager.hyprland.settings.bind = [
+        "$mod, R, exec, ${pkgs.rofi}/bin/rofi -show drun"
+        "$mod SHIFT, X, exec, ${powerMenu}"
+      ];
+    };
+  };
+}